His quad/hamstring injuries the last two years have been when running the bases, which we'd all like to see him do MORE of. Not sure DHing only is the answer.
At what point do they start transitioning him to first base. Or, like his "move" to 2B or Mirandas move to 1B in the past, maybe they just stick him over there without any preparation and expect him to miraculously suddenly be good at it.